FLORA OF COLORADO. 



Subkingdom PTERIDOPHYTA. FERN-WORTS. 



Order i. OPHIOGLOSSALES. 

 Family i. OPHIOGLOSSACEAE Presl. ADDER'S-TONGUE FAMILY. 



i. BOTRYCHIUM Sw. MOONWORT. 



Plant large, the sterile leaf ternately decompound, sessile at the middle of the 

 stem. i. B. virginiannm. 



Plant small ; the leaf under 5 cm. long. 



Leaf triangular, sessile near the top of the stem. z. B. lanceolatum. 



Leaf oval, slightly stalked from near the middle of the stem or lower. , 



3. B. Lunaria. 



1. Botrychium virginianum (L.) Sw. Rich woods, N. S. to Labr., B. C 

 and Wash, to Texas and Fla. Arkansas Canon (Brandegee). 



2. Botrychium lanceolatum (S. G. Gmel.) Angs. In woods, N. J. and N. S. 

 to Alaska and Wash. " Colorado." 



3. Botrychium Lunaria (L.) Sw. In open places, Newf. to Alaska and 

 Utah: rare. Alt. about 12,000 ft. Gray's Peak. 



Order 2. FILICALES. 



Family 2. POLYPODIACEAE R. Br. FERN FAMILY. 



Sori round, or at least less than twice as long as broad. 

 Sori naked. 



Leaves jointed to the rootstock, simply pinnate. i. POLYPODIUM. 



Leaves continuous with the rootstock, ternately compound. 



2. PHEGOPTERIS. 



Sori covered with a membranous indusium when young. 

 Indusium superior. 



Indusium circular fixed by the center. 3. POLYSTICHUM. 



Indusium heart-shaped or reniform fixed by the sinus. 4. DRYOPTERIS. 

 Indusium inferior or lateral. 



Indusium inferior, breaking at maturity into stellate lobes. 



5. WOODSIA. 

 Indusium lateral, thrown back at maturity like a delicate hood. 



6. FILIX. 



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